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Almond - Tent Caterpillars

Direct copy from UC IPM website to word document Statewide IPM Program, Agriculture and Natural Resources, University of California All contents copyright © 2009 The Regents of the University of California. All rights reserved. Tent caterpillars overwinter in the egg stage; eggs give rise to destructive caterpillars in spring and early summer. Forest tent caterpillars are grayish with yellow stripes along the side, separated by a broad blue stripe. There is a row of white, keyhole-shaped spots on the back. Colonies build a mat of webbing and move out from it to feed. Western tent caterpillars are widespread in California but seldom seen in almond orchards. Their larvae are hairy and dull yellow-brown with rows of blue and orange spots on top of the bodies. Colonies of this caterpillar build silk tents around branch crotches and feed outside the tents. There is one generation each year.

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